Diseño y Construcción de un Transmisor de Temperatura Basado en Interfaz Digital Directa

Published in: Innovation and Development for the Americas: Engineering, Education, Research and Development: Proceedings of the 8th Latin American and Caribbean Conference for Engineering and Technology
Date of Conference: June 1-4, 2010
Location of Conference: Arequipa, Peru
Authors: Antonio Córdova
Angel Custodio
Refereed Paper: #29

Abstract

The interface between sensors and temperature transmitters microcontrollers normally require conventional analog circuitry and often of a complex design that increase their cost and size, to provide packaging to the measurement variables. On the need to simplify and optimize this interface is proposed the design and construction of a temperature transmitter based on direct digital interface with analog output for process control and data visualization. The randomly generated data from sensors (Pt100 and Thermistor) selectable temperature are processed by a Direct Digital Interface and sent directly to the microprocessor without the need for amplifiers or filters, or A / D converters In this way the circuit is significantly reduced in both design and cost. The error obtained was less than 1% across the margin.